1881749 has 2 divisors, whose sum is σ = 1881750. Its totient is φ = 1881748.

The previous prime is 1881697. The next prime is 1881751. The reversal of 1881749 is 9471881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 165649 = 1310^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881749 - 2⁸ = 1881493 is a prime.

Together with 1881751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940874 + 940875.

It is an arithmetic number, because the mean of its divisors is an integer number (940875).

2^1881749 is an apocalyptic number.

It is an amenable number.

1881749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881749 is an equidigital number, since it uses as much as digits as its factorization.

1881749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 1881749 is about 1371.7685664863. The cubic root of 1881749 is about 123.4583773586.

The spelling of 1881749 in words is "one million, eight hundred eighty-one thousand, seven hundred forty-nine".